Rion NL-42A, Инструкция по эксплуатации, Страница: 92 / 154

74
Measurement
Equivalent continuous sound level (
L
eq
) measurement
The procedure for equivalent continuous sound level measurement is described
below.
Preparations as described in the “Preparations” chapter must be completed fi rst.
1. Turn power to the unit on.
2. Press the MENU/ENTER key and select the frequency weighting
characteristic on the menu list screen. For normal sound level
measurements, select the “A” setting.
The frequency weighting characteristic can be set even on the
measurement setting screen in the menu list screen.
3. Select the time weighting characteristics on the menu list screen.
Normally, select the “F(Fast)” setting. (This setting does not affect a
measurement result of equivalent continuous sound level.)
The time weighting characteristic can be set even on the measurement
setting screen in the menu list screen.
Note
The unit performs high-speed sampling of the sound
pressure waveform (20.8 μs) to determine
L
eq
and
L
E
. It is therefore not affected by time weighting
characteristics.
4. Select [Display] on the menu list screen and set the upper and lower
limit of the bar graph. The upper and lower limit of the bar graph
can be set even on the measurement screen. If the “OUTPUT OVER”
indicators appear frequently, change the limit of bar graph setting.
5. Change the setting to display
L
eq
on the measurement screen.
Use the keys to select [Display] and press the MENU/
ENTER key. The display screen appears.
6. Use the keys to select [
L
eq
] and press the MENU/ENTER key.
The ON/OFF setting screen appears.